photo-uthographer



; y tait-rh' gisten atwt @Hirn IMPROVEMENT IN LET-OFF MOTION POR LOOMS.

tlge Sdganle neuer tu iu time tettas nteut mit making mi uf tige smite.

T0 ALL IT MAY OONCERN:

Be it known that I, RICHARD IVALKER., of Milford, in the county of Worcester, and State of Massachusetts, have invented a new and useful Improvement in Let-Oil` Motion for Looms, of which the following isla full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification, in which- `Figure 1 represents an endelevation of a loom with the improved let-oil` attached.

Figure 2 is a side elevationof the same.

Figure 3 is a section through the same on theline z z of iig. 1.

Figure si is a section through the same on theline x z of g..2.

Similar letters indicate like parts in the several gures.

The object of my invention is to provide a means for letting o` the warp on the yarn-beam when at a proper tension by means of a positive motion imparted by the backward motion Vof thellay; and the invention consists in the employment of a sliding-bar provided with two pawls, one being fixed to the said bar and the `other vibrating on the same at the` opposite end, and so arranged that one pawl will hold a ratchet-wheel which is placed between ther two, while the other pawl is passing over a tooth of the same, the two pawls acting on the ratchet alternately. On the shaft that carries the ratchet is a pinion that engages with agear-wheel on the yarrbbearn. Underneath the warp, and in close proximity to the whip-roll, is apressure-bar extending the whole width of tliewarp and pivoted to a lever arranged similarly to a scale-beam, and also connected by a series of rods and levers to the aforesaid sliding-bar that carries the two pawls, so that the tension of the warp acting upon the said cross-bar will bring a short connectingdiar, which is hinged to the aforesaid sliding-bar, to a position in which it will be struck by aprojection on the sword of the lay, on the backward motion of the latter, and thus impart motion to the sliding-bar and pawl.

Referring to the drawings, G represents the frame of the loom; A. is the yarn-beam; and aa represent the Warp; B is the whip-roll, over which the warp passes on leaving` the yarn-beam. C is a pressure-bar pivoted to a bearer, e, the upper edge of which may be elevated as desired above the level of the whip-roll, by means of va screw, which, passing through a vertical slot in the short arm of the lever D, is pivoted to an arm, E, which is attached to a standard, F, secured to the frame G. To Athe end of the long arm of the lever D is attached a rod, H, which passes down freely through a guide, I, secured to the frame G. To the rod H, above the guide I, is attached a short arm, g, which may he adjusted higher or lower on the rod H. This army passes loosely into a` hole in the lever Jat h, (iig. l.) 'Beneath the guide I, -on the rod H, is arranged a spiral spring, `c,'its upper end bearing against the said guide and its lowerend resting upon a nut, z', which is screwed upon the lower end of the rod H, lby which means the degree of tension on the pressure-bar C may be regulated. One end of the lever J is pivoted to an adjustable standard, K, attached to the main frame Gr, and the. other end of said lever is c onnected by means of an upright bar, L, to one end of a bar, M,as shown in iig. 4, the other end of said bar M being pivoted to the escapement slide R, which has a free longitudinal movement lin a. supporter, N, as shown in figs. l and 4. The supporter N is provided with guides, nn, at each end, for holding the escapement slide, which is slotted near the centre to admit of its free motion on the axle m of the ratchet-wheel P and pinion Q. The supporter N carries an axle, fm, on which is borne the ratchet-wheel P and pinion` Q,4tl1`e latter engaging with the gear-wheel W on the yarn-beam. The escapement slide R is provided with two pawls, one of which,p, is firmly fixed to the slide at one end, and the other, r, isfpivoted to the opposite end of the slide so as to operate as a single pawl when" the warp is wound on the yarn-beam, being prevented from rising too high by a spring, e, and from falling by a pin, t', The supporter N contains in a slot, as shown in iig. 1, a spiral spring, T, one end of which is attached to the escapement Vslide R, and the other presses against the end of the slot, thus forcing the pawl r towards the ratchet P. Attached vto the sword of the lay' U, isa projection or herinner, u, which may be rigidly attached, or, passing through the sword, may be connected with aspring, as shown in fig. 4. As the lay is moved backwards the hammer U strikes against the end of the bar M, which forces the escapement slide R towards the ratchet-wheel P, with which the pawlp engages whilethe pawl r is relieved.` When the lay mov-cs forward again the spring T, in the supporter N, throws the,eseapement slide back to its former position, end the pawl t' againgengeges with the ratchet-wheel, thus nllowing but one toetlz to pees the pewls at once and letting oil' e certain amount of yarn at each backward stroke of lthe lay. The pressure of the warp on the pressure-bar C causes the lever D, (by means of the rod H, the lever J, nnd bm*- Lf) to raise the ber M to n position tobe struck by the hammer u. When the pressure of the warp on the bei' C is insuicient, the end of the bar M will fell below the hammer u, end consequently the let-oil` will not take pleee until the tension becomes sufficient to'ngain bring the proper amount of pressure on the bar C. In the escape ment arrangement as commonly employed the teethare lible to slip :1ndbreak, the escapemcnt passing over occasionally more than one tooth et a time. In my invention such :t contingency is not liable to occur, as the motion is positive and the pewls con pass but one tooth et mtime.

Having thus described my invention, what I claim as new, and desire to secureby Letters Patent, is

1. A let-oil" motion in looms effected by means-of :t horizontal sliding-ber R, provided with pawls, es`

described, in connection with :t ratchet-wheel P, the said sliding-bar being operated by thc hammer u on the lay, which in its backward movementv strikes the horizontal intermediate bar M.

2. I claim the combination of the pivoted pressure-bar C, located as described, with n series of adjustable levers and rods, in such a manner, that thctension of the warp upon thc pressure-bar will cause a. bar, M, to be brought in a position to be operated by the backward movement of the lay, and thus operate the escnpement slide R, substantially es described.

3. I claim regulating the degree of tension which will determine the position of the ber M, by means ofthe seriesvof adjustable bars, levers, and rods, operated by the pressure-ber C 'located'below the warp, substantially as described.

In testimony whereof I have signed my neme to this specification in the presence of t-Wovsubscribing Witnesses.

RICHARD WALKER Witnesses:

OHAS. WALKER, J. H.' ADAMs. 

